PHP/inheritance - Revision history

Woozle at 13:28, 5 April 2024

2024-04-05T13:28:31Z

← Older revision		Revision as of 13:28, 5 April 2024
Line 6:		Line 6:
	{\| class='wikitable sortable'		{\| class='wikitable sortable'
	! arguments \|\| B instanceof A \|\| is_a(B,A,FALSE) \|\| is_a(B,A,TRUE) \|\| is_subclass_of(B,A,FALSE) \|\| is_subclass_of(B,A,TRUE)		! arguments \|\| B instanceof A \|\| is_a(B,A,FALSE) \|\| is_a(B,A,TRUE) \|\| is_subclass_of(B,A,FALSE) \|\| is_subclass_of(B,A,TRUE)
			\|-
			\| colspan=6 \| compare things to cA
	\|-		\|-
	\| cA, cA		\| cA, cA
Line 34:		Line 36:
	\| Y		\| Y
	\| Y		\| Y
			\|-
			\| colspan=6 \| compare things to iA
	\|-		\|-
	\| cA, iA		\| cA, iA
Line 62:		Line 66:
	\| Y		\| Y
	\| Y		\| Y
			\|-
			\| colspan=6 \| compare things to iB
	\|-		\|-
	\| cB, iB		\| cB, iB
Line 76:		Line 82:
	\| Y		\| Y
	\| Y		\| Y
			\|-
			\| colspan=6 \| compare things to tA
	\|-		\|-
	\| cA, tA		\| cA, tA
Line 97:		Line 105:
	\| -		\| -
	\| -		\| -
			\|-
			\| colspan=6 \| compare xD to things (should always be FALSE)
	\|-		\|-
	\| cD, cA		\| cD, cA
Line 113:		Line 123:
	\|}		\|}

	Code for entities used in the test:		Code just for entities used in the test (full code is [[/code\|here]]):
	<syntaxhighlight lang=php>		<syntaxhighlight lang=php>
	interface iA {}		interface iA {}
Line 127:		Line 137:

	Conclusions:		Conclusions:
	* Nothing sees ~~traits~~ as ~~parent-classoids~~.		* Nothing sees <tt>trait</tt>s as parents.
	* <tt>is_a(A,B,FALSE)</tt> is useless unless A is an object (always returns FALSE).		* <tt>is_a(A,B,FALSE)</tt> is useless unless A is an object (always returns FALSE).
	* <tt>is_subclass_of()</tt> is the same as <tt>is_a(A,B)</tt> except it will return FALSE if cA (aka $oA's class) is the same as cB.		* <tt>is_subclass_of()</tt> is the same as <tt>is_a(A,B)</tt> except it will return FALSE if cA (aka $oA's class) is the same as cB.

Woozle at 13:06, 5 April 2024

2024-04-05T13:06:21Z

@@ Line 1: / Line 1: @@
 ==About==
-PHP includes a few bits of functionality for checking whether an object or class inherits from another classoid (class, interface, or trait). The rules for this functionality are not always clearly explained.
+PHP includes a few bits of functionality for checking whether an object or class inherits from another class or interface. The rules for this functionality are not always clearly explained.
 ===Class Inheritance Functions Testing===
@@ Line 21: / Line 21: @@
 | Y
 |-
-| oB, cA
+| $oA, cA
 | Y
 | Y
@@ Line 33: / Line 40: @@
 | Y
 | -
 | Y
 |-
@@ Line 40: / Line 54: @@
 | Y
 | -
 | Y
 |-
@@ Line 49: / Line 70: @@
 | Y
 |-
-| oB, iA
+| $oB, iB
 | Y
 | Y
@@ Line 56: / Line 77: @@
 | Y
 |-
-| oB, iB
+| cA, tA
-| Y
+| -
-| Y
+| -
-| Y
+| -
-| Y
+| -
-| Y
+| -
 |}
-Key:
+Code for entities used in the test:
-* cX = class X
+<syntaxhighlight lang=php>
-* iX = interface X
+interface iA {}
-* oX = object of class X
+interface iB extends iA {}            // interface B inherits from interface A
-* tX = trait X
+trait tA {}

Woozle at 12:39, 5 April 2024

2024-04-05T12:39:08Z

← Older revision		Revision as of 12:39, 5 April 2024
Line 4:		Line 4:
	===Class Inheritance Functions Testing===		===Class Inheritance Functions Testing===
	Here's a truth-table from PHP 8.2.10:		Here's a truth-table from PHP 8.2.10:
	{\| class="wikitable sortable"		{\| class='wikitable sortable'
	! arguments \|\| B instanceof A \|\| is_a(B,A,FALSE) \|\| is_a(B,A,TRUE) \|\| is_subclass_of(B,A,FALSE) \|\| is_subclass_of(B,A,TRUE)		! arguments \|\| B instanceof A \|\| is_a(B,A,FALSE) \|\| is_a(B,A,TRUE) \|\| is_subclass_of(B,A,FALSE) \|\| is_subclass_of(B,A,TRUE)
	\|-		\|-
Line 63:		Line 63:
	\| Y		\| Y
	\|}		\|}

			Key:
			* cX = class X
			* iX = interface X
			* oX = object of class X
			* tX = trait X

Woozle: Created page with "==About== PHP includes a few bits of functionality for checking whether an object or class inherits from another classoid (class, interface, or trait). The rules for this func..."

2024-04-05T12:35:16Z

Created page with "==About== PHP includes a few bits of functionality for checking whether an object or class inherits from another classoid (class, interface, or trait). The rules for this func..."

New page

==About==
PHP includes a few bits of functionality for checking whether an object or class inherits from another classoid (class, interface, or trait). The rules for this functionality are not always clearly explained.

===Class Inheritance Functions Testing===
Here's a truth-table from PHP 8.2.10:
{| class="wikitable sortable"
! arguments || B instanceof A || is_a(B,A,FALSE) || is_a(B,A,TRUE) || is_subclass_of(B,A,FALSE) || is_subclass_of(B,A,TRUE)
|-
| cA, cA
| -
| -
| Y
| -
| -
|-
| cB, cA
| -
| -
| Y
| -
| Y
|-
| oB, cA
| Y
| Y
| Y
| Y
| Y
|-
| cA, iA
| -
| -
| Y
| -
| Y
|-
| cB, iA
| -
| -
| Y
| -
| Y
|-
| cB, iB
| -
| -
| Y
| -
| Y
|-
| oB, iA
| Y
| Y
| Y
| Y
| Y
|-
| oB, iB
| Y
| Y
| Y
| Y
| Y
|}